GHSA-M394-8RWW-3JR7

Vulnerability from github – Published: 2021-03-10 03:46 – Updated: 2021-10-21 14:14
VLAI
Summary
DOS vulnerability for Quoted Quality CSV headers
Details

Impact

When Jetty handles a request containing request headers with a large number of “quality” (i.e. q) parameters (such as what are seen on the Accept, Accept-Encoding, and Accept-Language request headers), the server may enter a denial of service (DoS) state due to high CPU usage while sorting the list of values based on their quality values. A single request can easily consume minutes of CPU time before it is even dispatched to the application.

The only features within Jetty that can trigger this behavior are:

  • Default Error Handling - the Accept request header with the QuotedQualityCSV is used to determine what kind of content to send back to the client (html, text, json, xml, etc)
  • StatisticsServlet - uses the Accept request header with the QuotedQualityCSV to determine what kind of content to send back to the client (xml, json, text, html, etc)
  • HttpServletRequest.getLocale() - uses the Accept-Language request header with the QuotedQualityCSV to determine which “preferred” language is returned on this call.
  • HttpservletRequest.getLocales() - is similar to the above, but returns an ordered list of locales based on the quality values on the Accept-Language request header.
  • DefaultServlet - uses the Accept-Encoding request header with the QuotedQualityCSV to determine which kind of pre-compressed content should be sent back for static content (content that is not matched against a url-pattern in your web app)

Versions

QuotedQualityCSV was introduced to Jetty 9.3.9.v20160517 and the bug that introduced the vulnerability was in 9.4.6.v20170531.

Currently, known vulnerable versions include:

  • 9.4.6.v20170531 thru to 9.4.36.v20210114
  • 10.0.0
  • 11.0.0

Workarounds

Quality ordered values are used infrequently by jetty so they can be avoided by:

  • Do not use the default error page/handler.
  • Do not deploy the StatisticsServlet exposed to the network
  • Do not call getLocale API
  • Do not enable precompressed static content in the DefaultServlet

Patches

All patches are available for download from the Eclipse Jetty website at https://www.eclipse.org/jetty/download.php - 9.4.37.v20210219 and greater - 10.0.1 and greater - 11.0.1 and greater

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.jetty:jetty-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.4.6"
            },
            {
              "fixed": "9.4.37"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.jetty:jetty-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "10.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "10.0.0"
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.eclipse.jetty:jetty-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0"
            },
            {
              "fixed": "11.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "11.0.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2020-27223"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-03-10T03:46:22Z",
    "nvd_published_at": "2021-02-26T22:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nWhen Jetty handles a request containing request headers with a large number of \u201cquality\u201d (i.e. q) parameters (such as what are seen on the `Accept`, `Accept-Encoding`, and `Accept-Language` request headers), the server may enter a denial of service (DoS) state due to high CPU usage while sorting the list of values based on their quality values.  A single request can easily consume minutes of CPU time before it is even dispatched to the application.\n\nThe only features within Jetty that can trigger this behavior are:\n\n- Default Error Handling - the `Accept` request header with the `QuotedQualityCSV` is used to determine what kind of content to send back to the client (html, text, json, xml, etc)\n- `StatisticsServlet` - uses the `Accept` request header with the `QuotedQualityCSV` to determine what kind of content to send back to the client (xml, json, text, html, etc)\n- `HttpServletRequest.getLocale()` - uses the `Accept-Language` request header with the `QuotedQualityCSV` to determine which \u201cpreferred\u201d language is returned on this call.\n- `HttpservletRequest.getLocales()` - is similar to the above, but returns an ordered list of locales based on the quality values on the `Accept-Language` request header.\n- `DefaultServlet` - uses the `Accept-Encoding` request header with the `QuotedQualityCSV` to determine which kind of pre-compressed content should be sent back for static content (content that is not matched against a url-pattern in your web app)\n\n### Versions\n`QuotedQualityCSV` was introduced to Jetty 9.3.9.v20160517 and the bug that introduced the vulnerability was in 9.4.6.v20170531. \n\nCurrently, known vulnerable versions include:\n\n- 9.4.6.v20170531 thru to 9.4.36.v20210114\n- 10.0.0\n- 11.0.0\n\n### Workarounds\n\nQuality ordered values are used infrequently by jetty so they can be avoided by:\n\n * Do not use the default error page/handler.\n * Do not deploy the `StatisticsServlet` exposed to the network\n * Do not call `getLocale` API\n * Do not enable precompressed static content in the `DefaultServlet` \n\n### Patches\n\nAll patches are available for download from the Eclipse Jetty website at [https://www.eclipse.org/jetty/download.php](https://www.eclipse.org/jetty/download.php)\n- 9.4.37.v20210219 and greater\n- 10.0.1 and greater \n- 11.0.1 and greater",
  "id": "GHSA-m394-8rww-3jr7",
  "modified": "2021-10-21T14:14:05Z",
  "published": "2021-03-10T03:46:47Z",
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    },
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    },
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    },
    {
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    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "DOS vulnerability for Quoted Quality CSV headers"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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